Other Balance Sheet Information - Additional Information (Detail) (Inventory Valuation Reserve, USD $)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for excess and obsolete inventory	$ 24,700,000	$ 23,800,000	$ 27,700,000
Charges/credits to reserves for excess and obsolete inventory	2,200,000	(1,900,000)	12,800,000
Reduction in reserves for excess and obsolete inventory	3,500,000	1,500,000	1,400,000
Acquisitions, net of divestitures
Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for excess and obsolete inventory	$ 2,500,000

Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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